your model has a brake pressure sensor on the master cylinder that can be the issue, you need to test the power in and out of the sensor when the brake pedal is and is not pressed to see if it is changing values. that would tell you if it is working, then we need to check all the fuses in the trunk fuse box making sure they are all ok, of all 3 brake lights do not work then the issue is most likely the brake pressure switch, this was a very common issue . let me know if this helps, Lou P.